Have genuinely tried everything to get this working. Was building site with lots of Snippets, including for CSS so that we had area-specific style sheets. In case that was the issue, I got rid of them all and dumped them and the @font-face calls back into simple.css.
Have added this snippet:
add_filter( 'block_editor_settings_all', function( $editor_settings ) {
$css = wp_get_custom_css_post()->post_content;
$editor_settings['styles'][] = array( 'css' => $css );
return $editor_settings;
} );
Still nothing showing when editing pages. Grateful for a pointer here – all info in Private section. Thanks.
*** Edited to add: please feel free to take over editing if example page shows somebody else editing. This is a dev server, do whatever you need!